JP2725240B2 - Digital fluid fuel supply control system and device for heating device such as boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a digital fluid fuel supply control system for a heating device such as a boiler.

[0002]

2. Description of the Related Art In a conventional heating apparatus such as a boiler using a fluid fuel having a single burner, the amount of heat generated is controlled by controlling a fuel supply pressure to the burner.
It is performed by changing the supply amount. Further, in a heating device having a plurality of burners, the supply pressure of the fluid fuel to all the burners is changed to simultaneously and uniformly control the supply amount of the fluid fuel, and a priority set according to the load. Some control the amount of fuel supplied to each burner according to the order. Thus, by controlling the fuel supply amount by changing the fuel supply pressure to the burner, the combustion air accompanying this is supplied mechanically or electrically in proportion to the fuel supply amount. Is done.

[0003] The disadvantages of this conventional system are that it is necessary to perform the control delicately and with high precision, and the supply pressure of the fluid fuel is proportional to the square of the flow rate. , The supply pressure must be reduced to 1/9, and it is difficult to carry out this precisely.

In order to eliminate such drawbacks, a heating device in a boiler or the like is constituted by a plurality of burners having the same capacity, and the number of burners burning according to a load, that is, a change in temperature or pressure of hot water. Some are controlled. However, in this case, the number of controllable stages is proportional to the number of burners. For example, in a heating device including three burners, only four stages of control including a complete stop state can be performed. That is,
It is impossible to control the number of stages equal to or more than "the number of burners + 1".

[0005]

SUMMARY OF THE INVENTION The present invention relates to a conventional heating device which has a plurality of burners and is relatively simple to control, but can only obtain the number of control steps up to "the number of burners + 1". It is an object of the present invention to provide a digital fuel supply control system for a heating device such as a boiler, which can be improved to provide much finer control than before.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the method of the present invention comprises a plurality of series in which the capacity ratio is made proportional to a series of series by a counting method using two bases (binary system). A heating device is constituted by a burner, and a combination of burners involved in combustion is freely selected from all combinations of the burners according to a load.

Further, in order to solve the above-mentioned problems, the apparatus of the present invention comprises a plurality of burners having different capacity ratios in accordance with a binary system, a fluid fuel supply means for each burner, and a steam heater heated by the burner. In response to data based on the temperature and pressure of steam sent from a boiler or the like as a supply destination, a digital device connected to each of the fluid fuel supply means to selectively operate a desired one of the burners. It is characterized by having a controller.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a piping diagram of a main part in one embodiment of the present invention. The heating device in this embodiment is equipped with four burners (1) to (4). The capacity of each burner (1) to (4), that is, the ratio of fuel consumption is 1: 2: 4: 8 in order. This is 2 ⁰ : 2 ¹ : 2 in base 2 counting, ie, binary.
^2: nothing less than to 2 ³ of the series column.

Each of the burners (1) to (4) comprises a metering pump (21) to (24) driven by an electric motor (11) to (14), respectively.
Is connected to the fuel tank (5).

A digital controller (6) is connected to each of the motors (11) to (14), and a boiler or the like (a steam turbine, a reaction tower, or the like) to which steam to be heated by the burners (1) to (4) is supplied. In response to data based on the temperature and pressure of the steam sent from the heating furnace, the hot blast stove, and the dryer), selectively supply power to each of the electric motors (11) to (14),
A required one of the metering pumps (21) to (24) is driven.

At the start of work, a digital controller
By (6), electric power is supplied to all the electric motors (11) to (14), and all the burners (1) to (4) are burned.

As the temperature and pressure of the steam at the steam supply destination increase, the digital controller (6) automatically selects the optimum combination of burners, and is the most preferable mode corresponding to the fluctuation of the temperature and pressure of the steam. Then, burn the burner.

If the number of burners is n, the heating power by the selected combination, that is, the number of control stages of the fuel supply amount, is as follows:
Including the time of non-combustion, it becomes 2 × 2 ^n-1 . For example, FIG.
In the heating device provided with the four burners (1) to (4) shown in (1), the heating power associated with the non-operation of each burner is shown in the following table.

[0014]

[Table 1]

As described above, it can be seen that the selection of the four burners (1) to (4) performs a fine control of the heating power in 16 stages including the complete stop of the combustion.

It is evident that by increasing the number of burners with high capacity in the series in binary, the heating power stage can be increased dramatically.

It is needless to say that the present invention is not limited to the above-described embodiment, and various modifications or improvements can be made within the spirit of the invention.

For example, as shown in FIG. 2, the motor-driven metering pumps (21) to (24) in the embodiment shown in FIG.
The solenoid valves (31) to (34) may be replaced and controlled by the digital controller (6) in the same manner as in the first embodiment.

[0019]

In the conventional heating device having a plurality of burners having the same capacity, the control of the supply amount of the fluid fuel can be performed only up to the same number of stages as the number of the burners. The difference in fuel supply was inevitably large,
According to the present invention, by making each capacity of a plurality of burners proportional to a series series in a binary system, compared with a conventional heating device having a plurality of burners of the same capacity, much finer, And it can be controlled in multiple stages.

In addition, since a high thermal efficiency can be obtained by rational control as compared with the conventional one, it is possible to contribute to a reduction in fuel cost and, moreover, a reduction in air pollution.

[Brief description of the drawings]

FIG. 1 is a piping diagram showing a first embodiment of the present invention.

FIG. 2 is a piping wiring diagram showing a second embodiment in the same manner.

[Explanation of symbols]

 (1)-(4) Burner (5) Fuel tank (6) Digital controller (11)-(14) Electric motor (21)-(24) Metering pump (31)-(34) Solenoid valve

Claims (2)

(57) [Claims] 1. A heating device is constituted by a plurality of burners whose capacity ratio is made proportional to a series of series by a counting method (binary system) in which the base is 2 and a combination of all the burners. A digital fluid fuel supply control method for a heating device such as a boiler, wherein a combination of burners involved in combustion is selected from among them according to a load. 2. A plurality of burners having different capacity ratios in accordance with a binary system, fluid fuel supply means for each burner, and steam supplied from a boiler or the like to which steam heated by the burner is supplied. Heating a boiler or the like, comprising: a digital controller coupled to each of the fluid fuel supply means for selectively operating a desired one of the burners in response to data based on temperature and pressure. Digital fluid fuel supply controller for the device.